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Breathing and Exchange of Gases

NEET (UG) 2020MCQMedium📈 Topic in 38% papers+4−1
Ques. 1NEET (UG) 2020

Identify the wrong statement with reference to transport of oxygen.

  1. Binding of oxygen with haemoglobin is mainly related to partial pressure of O2
  2. Partial pressure of CO2 can interfere with O2 binding with haemoglobin
  3. Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin
  4. Low pCO2 in alveoli favours the formation of oxyhaemoglobin

Answer

(3) Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin

Solution

As per NCERT, binding of oxygen with haemoglobin is primarily related to partial pressure of O2; partial pressure of CO2, hydrogen ion concentration and temperature can also interfere with this binding.

In the alveoli, high pO2, low pCO2, lesser H+ concentration and lower temperature favour the formation of oxyhaemoglobin, whereas in the tissues, low pO2, high pCO2, high H+ concentration and higher temperature favour dissociation of oxygen from oxyhaemoglobin.

∴ Statement (3) is wrong, because a higher H+ concentration favours dissociation, not formation, of oxyhaemoglobin.

Answer: (3)

Keep practising — Breathing and Exchange of Gases

Ques. 2NEET (UG) 2019

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

  1. 2200 mL
  2. 2700 mL
  3. 1500 mL
  4. 1700 mL
Ques. 3NEET (UG) 2019

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to :

  1. Proliferation of fibrous tissues and damage of the alveolar walls
  2. Reduction in the secretion of surfactants by pneumocytes
  3. Benign growth on mucous lining of nasal cavity
  4. Inflammation of bronchi and bronchioles
Out of syllabus
Ques. 4NEET 2018

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

  1. Decreased respiratory surface; Inflammation of bronchioles
  2. Inflammation of bronchioles; Decreased respiratory surface
  3. Increased number of bronchioles; Increased respiratory surface
  4. Increased respiratory surface; Inflammation of bronchioles
Ques. 5NEET 2018

Match the items given in column I with those in column II and select the correct option given below.

  1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  2. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  3. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  4. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
Ques. 6NEET 2018

Which of the following is an occupational respiratory disorder?

  1. Botulism
  2. Anthracis
  3. Silicosis
  4. Emphysema
Ques. 7NEET 2017

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of

  1. inspiratory reserve volume
  2. tidal volume
  3. expiratory reserve volume
  4. residual volume.
Ques. 8NEET 2016 (Phase 1)

Reduction in pH of blood will

  1. decrease the affinity of haemoglobin with oxygen
  2. release bicarbonate ions by the liver
  3. reduce the rate of heart beat
  4. reduce the blood supply to the brain.
Ques. 9NEET 2016 (Phase 1)

Name the chronic respiratory disorder caused mainly by cigarette smoking.

  1. Respiratory acidosis
  2. Respiratory alkalosis
  3. Emphysema
  4. Asthma
Ques. 10NEET 2016 (Phase 1)

Asthma may be attributed to

  1. inflammation of the trachea
  2. accumulation of fluid in the lungs
  3. bacterial infection of the lungs
  4. allergic reaction of the mast cells in the lungs.
Ques. 11NEET 2016 (Phase 2)

The partial pressure of oxygen in the alveoli of the lungs is

  1. equal to that in the blood
  2. more than that in the blood
  3. less than that in the blood
  4. less than that of carbon dioxide.

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